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Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost within one year | $ 40,283 | $ 20,532
Amortized cost one to five years | 41,593 | 42,476
Amortized cost for five to ten years | 102,753 | 107,839
Amortized cost for after ten years | 180,240 | 67,020
Total amortized cost | 364,869 | 237,867
Total available for sale investment securities, Amortized Cost | 753,115 | 608,909
Within one year, amortized cost | 6,413 | 70
One to five years, amortized cost | 54,558 | 48,732
Five to ten years, amortized cost | 98,134 | 101,809
After ten years, amortized cost | 33,631 | 40,658
Total amortized cost | 192,736 | 191,269
Total held to maturity investment securities, amortized cost | 210,306 | 210,112
Fair value within one year | 40,168 | 20,448
Fair value for one to five years | 41,671 | 41,705
Fair value for five to ten years | 107,719 | 107,107
Fair value for after ten years | 185,992 | 67,349
Total fair value | 375,550 | 236,609
Investment securities, available for sale | 767,230 | 600,348
Within one year, fair value | 6,479 | 70
One to five years, fair value | 55,545 | 49,324
five to ten years, fair value | 101,776 | 101,533
After ten years, fair value | 36,172 | 38,749
Total fair value | 199,972 | 189,676
Held-to-maturity, Fair Value | 217,718 | 208,273
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 243,366 | 187,563
Total held to maturity investment securities, amortized cost | 4,714 | 5,144
Investment securities, available for sale | 246,083 | 185,003
Held-to-maturity, Fair Value | 4,716 | 5,030
Federal Agency Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 144,880 | 183,479
Total held to maturity investment securities, amortized cost | 12,856 | 13,699
Investment securities, available for sale | 145,597 | 178,736
Held-to-maturity, Fair Value | $ 13,030 | $ 13,567

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 + Details
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